The Gear S2 is just 42 mm across and 11.4 mm thick, whille the Gear S2 Classic is only 40 mm across; both have 20 mm straps. There's also a matter of weight, with the Gear S3 Frontier coming in at The Gear S3 Frontier and Classic add GPS, speakerphones, optional LTE, and Samsung Pay. We take them for a wrist-spin. Samsung Gear S3 Frontier and Classic: Super-size watches go big on style I decided to upgrade my Frontier to the 41mm as well. I like the smaller watch rather than the larger S3. I found myself using the S2 classic titanium more than the S3 just due to the size. sgdMhK9.